Question

how to find radius of semi circle​

Answer 1

Answer:

Calculating the Radius of a Semicircle With a Known Diameter

First, write the equation for the diameter of a circle, which is the same as the diameter of a semicircle. Since the diameter of a circle, or d, is twice as long as the radius, or r, the equation for diameter is the following:

d = 2r

Now rearrange the equation for the diameter of a circle to solve for radius. To solve for r, divide both sides by two. Doing so gives the following:

r = d ÷ 2

Finally, plug in the value that you have been given for the diameter of the semicircle. For example, if the diameter has a value of 20 cm the calculation would look like this:

r = 20 cm ÷ 2 = 10 cm

Answer 2

to find radius divide it by 2